from .init import InitCommand
from .venv_command import VenvCommand


class AddCommand(VenvCommand, InitCommand):
    """
    Add a new dependency to <comment>pyproject.toml</>.

    add
        { name* : Packages to add. }
        { --D|dev : Add package as development dependency. }
        { --git= : The url of the Git repository. }
        { --path= : The path to a dependency. }
        { --E|extras=* : Extras to activate for the dependency. }
        { --optional : Add as an optional dependency. }
        { --python= : Python version( for which the dependencies must be installed. }
        { --platform= : Platforms for which the dependencies must be installed. }
        { --allow-prereleases : Accept prereleases. }
        { --dry-run : Outputs the operations but will not execute anything
                     (implicitly enables --verbose). }
    """

    help = """The add command adds required packages to your <comment>pyproject.toml</> and installs them.

If you do not specify a version constraint, poetry will choose a suitable one based on the available package versions.
"""

    _loggers = ["poetry.repositories.pypi_repository"]

    def handle(self):
        from poetry.installation import Installer
        from poetry.semver import parse_constraint

        packages = self.argument("name")
        is_dev = self.option("dev")

        if (self.option("git") or self.option("path") or self.option("extras")) and len(
            packages
        ) > 1:
            raise ValueError(
                "You can only specify one package "
                "when using the --git or --path options"
            )

        if self.option("git") and self.option("path"):
            raise RuntimeError("--git and --path cannot be used at the same time")

        section = "dependencies"
        if is_dev:
            section = "dev-dependencies"

        original_content = self.poetry.file.read()
        content = self.poetry.file.read()
        poetry_content = content["tool"]["poetry"]

        for name in packages:
            for key in poetry_content[section]:
                if key.lower() == name.lower():
                    raise ValueError("Package {} is already present".format(name))

        if self.option("git") or self.option("path"):
            requirements = {packages[0]: ""}
        else:
            requirements = self._determine_requirements(
                packages, allow_prereleases=self.option("allow-prereleases")
            )
            requirements = self._format_requirements(requirements)

            # validate requirements format
            for constraint in requirements.values():
                parse_constraint(constraint)

        for name, constraint in requirements.items():
            constraint = {"version": constraint}

            if self.option("git"):
                del constraint["version"]

                constraint["git"] = self.option("git")
            elif self.option("path"):
                del constraint["version"]

                constraint["path"] = self.option("path")

            if self.option("optional"):
                constraint["optional"] = True

            if self.option("allow-prereleases"):
                constraint["allows-prereleases"] = True

            if self.option("extras"):
                extras = []
                for extra in self.option("extras"):
                    if " " in extra:
                        extras += [e.strip() for e in extra.split(" ")]
                    else:
                        extras.append(extra)

                constraint["extras"] = self.option("extras")

            if self.option("python"):
                constraint["python"] = self.option("python")

            if self.option("platform"):
                constraint["platform"] = self.option("platform")

            if len(constraint) == 1 and "version" in constraint:
                constraint = constraint["version"]

            poetry_content[section][name] = constraint

        # Write new content
        self.poetry.file.write(content)

        # Cosmetic new line
        self.line("")

        # Update packages
        self.reset_poetry()

        installer = Installer(
            self.output,
            self.venv,
            self.poetry.package,
            self.poetry.locker,
            self.poetry.pool,
        )

        installer.dry_run(self.option("dry-run"))
        installer.update(True)
        installer.whitelist(requirements)

        try:
            status = installer.run()
        except Exception:
            self.poetry.file.write(original_content)

            raise

        if status != 0 or self.option("dry-run"):
            # Revert changes
            if not self.option("dry-run"):
                self.error(
                    "\n"
                    "Addition failed, reverting pyproject.toml "
                    "to its original content."
                )

            self.poetry.file.write(original_content)

        return status
